JPH0260750B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to an amorphous metal filament having a circular cross section and excellent heat resistance and strength. (Prior Art) A method of producing a metal filament directly from molten metal is an inexpensive method of producing a metal filament. Moreover, if the obtained metal filament has an amorphous structure, it has many excellent chemical, electrical, and physical features, and can be used in many electrical and electronic parts, composite materials, fiber materials, etc. There is an extremely strong possibility that it will be put into practical use in the following fields. In particular, in the case of amorphous alloys, by selecting an appropriate alloy composition, it is possible to achieve excellent properties such as significantly higher strength, no work hardening, and extremely viscous properties compared to conventionally used crystalline metals and crystalline alloys. Because it has mechanical properties,
If it is possible to obtain a high-quality amorphous metal filament with a circular cross section, it is highly expected to be used as a promising industrial material in the future. Regarding amorphous metals, see "Journal of Metals, Japan" No.
3, Vol.15 (1976), “Science” No.8 (1978
This is already known in 2010). Regarding amorphous metals with such excellent properties,
There is a strong desire to obtain high-quality filaments with a circular cross section by a simple manufacturing method called melt spinning. Currently, amorphous metal filaments with a circular cross section can be obtained by spinning directly from molten metal into a cooling liquid and solidifying them, such as the Pd _77.5 -Cu ₆ -Si _16.5 alloy (numbers are in atomic percent). The critical cooling rate is limited to alloys with a critical cooling rate of around 10 ³ °C/s (Scripta metallurgica
Vol.13, 1979, P463-467). The difficulty of making an alloy amorphous depends largely on the type and composition of the metal, and the critical cooling rate for Fe, Ni, and Co alloys, which are particularly important as practical materials, is approximately in the range of 10 ⁵ to ^{10 6} °C/sec. It is said that it is difficult to obtain an amorphous metal filament with a circular cross section because the cooling rate is slow in a cooling liquid. In other words, methods such as the gun method, piston-anvil method, roll quenching method, centrifugal quenching method, plasma jet method, etc., which have a high cooling rate, are currently used to obtain amorphous metals such as Fe, Ni, and Co alloys. . However, among the above-mentioned methods, all methods other than the roll quenching method and the centrifugal quenching method can only yield irregularly shaped plates. In the roll quenching method and the centrifugal quenching method, the reality is that only regular ribbons can be obtained, and because they are flat, they have the disadvantage that they cannot be used for anything other than special purposes. The manufacturing method of this ribbon-shaped amorphous metal filament is described in the above-mentioned literature on amorphous alloys, as well as in Japanese Patent Application Laid-Open No. 49-91014 (US3856513) and Japanese Patent Application Laid-Open No.
No. 53-125228, JP-A-53-125229, JP-A-52-
No. 88219, Japanese Patent Publication No. 52-50727, Japanese Patent Publication No. 1977-101203
No., JP-A-51-4017, JP-A-51-109221 (DT2606581, FR2301605), JP-A-53-12719
It is known from many patent publications such as JP-A-53-12720, JP-A-52-133826 (DT2719710, FR2350159), and JP-A-52-88220. In this way, the conventional manufacturing method of amorphous metal filament is based on the principle of injecting molten metal onto the surface of a rapidly cooled body, so flattening of the contact surface is unavoidable, resulting in a circular cross-section. It was simply impossible to obtain a filament with such properties. Attempts have been made to make the cross section circular by making round grooves on the surface of the roll and injecting molten metal into them, but the molten metal could not be accurately injected into the very narrow grooves. Technically, the chances of success were extremely small. On the other hand, a number of manufacturing methods have been developed to obtain metal filaments with circular cross sections directly from molten metal. One method is similar to the so-called melt-spinning of synthetic fibers, which is currently mass-produced, in which a highly unstable, low-viscosity metal stream is cooled and solidified while maintaining continuity. For example, Japanese Patent Publication No. 45-24013 proposes a method of forming an oxidized or nitrided film on the surface of a molten filament by spinning it into an atmospheric gas that is reactive with metals as a stabilizing means related to such cooling and solidification. ing. However, when this proposal is examined in detail, it is extremely difficult to stabilize the molten metal in the same way as in the solidified state just by forming a film. Furthermore, this method can only employ specific metals that form oxidized or nitrided films. In addition, Japanese Patent Publication No. 44-25374 provides an extremely useful method for cooling molten metal, in particular by spraying flux particles suspended in an inert gas into an ionized region by corona discharge. However, the method of cooling and solidifying molten metal using the latent heat of this flux is noteworthy. Regarding this similar cooling method, for example, Japanese Patent Application Laid-Open No. 48-56560,
No. 48-71359 also proposes a method in which molten metal is spun into dense foam or bubbles and then cooled and solidified. However, in either method, the cooling solidification rate is quite slow, and the chemical or electrostatic stabilization of the spinning flow is still insufficient. In addition, as another method, "Chemical Fiber Monthly" No. 7 (1974
2007) As described on page 61, copper, silver, and other chip-shaped metals are placed in a glass tube, the glass tube and metal are heated and melted using an induction heating coil, and then pulled from the bottom with a preheated glass rod. Pull it out and roll it up.
There is a metal composite thread method that takes advantage of the stringiness of glass. However, this composite spinning method is effective only for a specific combination of the melt viscosity of glass and the melting temperature of metal, and has not yet been applied to all metals. Moreover, because it is a composite spinning method, the structure of the melting section and the spinning nozzle section is complicated, and a high degree of precision is required. Furthermore, in order to use it as a metal filament, it is necessary to remove the glass film on the outer periphery, which increases manufacturing costs.
Industrialization involves many problems. Furthermore, as in Japanese Patent Application Laid-Open No. 135820/1984, a method has been proposed in which a metal filament is produced in which the spun molten metal is spouted into a cooling liquid flowing in parallel. In addition, since the speed is low (200 m/min or less) and the flow is parallel, the cooling capacity is insufficient as described below. Moreover, since the coolant falls naturally due to gravity, it is extremely difficult to maintain a stable coolant and liquid level due to collisions with spun molten metal, boiling, and convection. Unable to obtain crystalline filaments. Furthermore, it is industrially very difficult to directly wind up the solidified filament continuously. In addition, a cooling liquid is placed in a rotating drum, a liquid film is formed on the inner wall of the drum by centrifugal force, and a jet of molten lead is spouted into this liquid film to produce a continuous thin lead wire with a circular cross section. The method is described in Japanese Patent Application Laid-Open No. 1983-64948, title No. 331 of the lecture proceedings of the 1983 Autumn Meeting of the Japan Institute of Metals (83rd, held in Toyama). However, this method can only be applied to low-melting metals with good stringiness, such as lead, and in particular, the ejection speed of the molten metal stream, which is described as a necessary condition for implementing this method, cannot be applied. Under conditions where the rotational speed of the drum is higher than that of the drum, it is absolutely impossible to form a high-quality continuous thin wire of an amorphous alloy. Furthermore, the continuous thin lead wires obtained by this method were not amorphous, had low circularity in cross section, were curved, and had large thickness irregularities in the length direction, and could not be put to practical use. (Problem to be Solved by the Invention) Therefore, the present inventors first used an alloy of various combinations of metal elements Fe, Ni, and Co, which are important as practical materials, and metalloid elements, and used a molten metal in a rotating cooling liquid. We investigated which metal elements have an excellent ability to form fine wires when rapidly solidified. As a result, it was found that the Ni-based alloy formed almost spherical shots in the rotating cooling liquid and had an inferior ability to form fine wires, whereas the Fe-based alloy, which had the lowest raw material price, had an extremely superior ability to form fine wires. Co-based alloys have a slightly inferior ability to form fine lines compared to Fe-based alloys. The ability to form fine wires here refers to the ability to form a continuous filament with a circular cross section and uniform thickness in the length direction when a molten metal stream is spun into a rotating cooling liquid and cooled and solidified. say. To explain in more detail by giving an example, it is well known that uniform, continuous, amorphous, flat filaments can be obtained very easily by centrifugal quenching of Ni-Si-B alloys, which are representative of Ni-based alloys. It is about. However, even when a molten metal stream is spun into a rotating cooling liquid and rapidly solidified, continuous filament-like objects are hardly obtained, and mostly spherical shots are obtained.
In addition, Pd ₈₂ has a slow critical cooling rate of 1.8×10 ³ °C/sec.
-Si ₁₈ (atomic %) alloy also becomes almost spherical shots when rapidly solidified in a rotating cooling liquid, and its ability to form fine wires is poor, but Pd-Cu-Si alloys with Cu added to this alloy, It has excellent ability to form fine wires and can produce amorphous continuous filaments with very uniform circular cross sections. However, this alloy is very expensive. Next, we will examine the relationship between the metalloid elements that contribute to the amorphization of the alloy and their ability to form fine lines.
There are surprising differences in the ability to form fine wires in a rotating cooling liquid depending on the type and combination of metalloid elements.For example, as mentioned above, metalloid elements such as Fe and Co, which have extremely excellent ability to form fine wires, A comparative study of the ability of fine wire formation in a rotating cooling liquid for alloy systems to which elements have been added shows that Fe-Si-B≧Fe-P-
It has excellent fine wire forming ability in the order of Si≧Co-Si-B≧Fe-P-C alloy, Fe-P-B, Fe-
C-B alloys have almost no ability to form fine wires. As mentioned above, the ability to form thin wires in a rotating cooling liquid clearly differs depending on the type of metal element and metalloid element. The reason for this cannot be clarified at present, but it is thought that the viscosity of the molten metal flow, surface tension, cooling rate, physical and chemical interactions with the rotating coolant, etc. are influential. Moreover, like the ability to form fine lines, the ability to form an amorphous state is greatly influenced by the type of metalloid element added, and in general, Fe-P-C≧Fe-
The amorphous formation ability is higher in the order of Si-B>Co-Si-B>Fe-P-Si alloys, and in Fe-P-Si alloys,
Even if a uniform continuous thin wire is obtained, it is difficult to obtain one with an amorphous structure due to the low ability to form an amorphous structure. From this, an amorphous metal filament with a circular cross section and an alloy that has the ability to form an amorphous material, which is made of an alloy mainly composed of Fe, which is important as a practical material, is ejected from a spinning nozzle into a rotating body containing a cooling liquid. After the molten metal is cooled and solidified, the circumferential speed of the rotating body is set to the same speed as the speed at which the molten metal is spouted from the spinning nozzle when the rotating centrifugal force of the rotating body is used to continuously wind the molten metal onto the inner wall of the rotating body. He proposed a method for manufacturing an amorphous metal filament with a circular cross section at a faster speed than that, and filed a patent application. However, this method was not sufficient to obtain an amorphous metal filament. (Means for Solving the Problems) As a result of intensive research in order to solve the above problems, the present inventors have discovered that filament The present invention was completed based on the discovery that it is possible to obtain a high-quality amorphous metal filament with a circular cross section that is strong, has little variation in elongation, and is less likely to break during processing. That is, in the present invention, Si is 17.5 atomic % or less and B5
~22.5 at%, and the sum of Si and B is 20 to 32.5 at%
An amorphous wire made of an alloy in which the remainder is substantially composed of Fe, has a wire diameter that satisfies the following general formula (), has a circular cross section, and has a thickness unevenness of 12% or less in the length direction. quality metal filament and Si17.5 at% or less, B5 to 22.5 at%, Co, Ni, Cr, Mo,
Alloys in which one or more metals selected from the group consisting of V, W, and Zr account for 30 atomic % or less, and the balance consists essentially of Fe (provided that the sum of Si and B is 20 to 32.5 atomic%, Co30 atomic% or less,
Ni 20 atomic% or less, Cr 10 atomic% or less, Mo 10 atomic%
Below, V5 atomic% or less, W5 atomic% or less, and Zr5 atomic% or less. ), has a wire diameter that satisfies the following general formula (), has a circular cross section, and has thickness unevenness in the length direction of 12% or less. D _F ≦270−9｜Si−10｜−25｜B+Si/2−20｜
………() [However, D _F is the filament wire diameter (μm), Si
represents Si atomic % in the alloy, and B represents B atomic % in the alloy. ] The amorphous metal filament of the present invention is made of the alloy shown below, and the thickness unevenness in the length direction of the filament is 12% as shown in the following example.
It has excellent uniformity as follows. The fact that there is very little variation in thickness in the length direction means that there is little variation in the strength and elongation of the filament, and that the amorphous metal filament can be easily processed by wire drawing, twisting, weaving, knitting, etc. This indicates that since subsequent processing is required, the amorphous metal filament is less likely to break during the processing. In order to manufacture the amorphous metal filament of the present invention, for example, the following manufacturing method may be used. First, to explain the alloy used in the present invention, as mentioned above, Fe, which is important as a practical material,
Among Ni and Co-based alloys, Fe-Si-B-based alloys have both excellent ability to form fine wires and excellent ability to form an amorphous state in a rotating cooling liquid. Furthermore, the ability to form an amorphous state is greatly influenced by the amounts of Si and B added to the Fe-Si-B alloy. In other words, the amount of Si and B applied is less than 17.5 atomic% Si, B5
~22.5 at%, and the sum of Si and B is 20 to 32.5 at%
It is necessary that the amount of Si and B is increased or decreased, and the ability to form an amorphous state decreases. Next, the Fe-Si-B alloy has a tendency to cause nozzle clogging, dirt, etc., and if a part of the Fe metal element is added up to 30 atomic % Co and 20 atomic % Ni, it will form an amorphous state. Nozzle clogging, dirt, etc. can be improved with almost no change in performance and fine line forming ability. In addition, Cr, Mo, V, W and Zr metal elements are added to Fe.
By substituting part of the metal element, heat resistance and strength can be improved. In this case, Cr, Mo are each 10 atomic % or less, V, W and
For Zr, if each is less than 5 atomic %,
A high-quality continuous amorphous metal filament with a circular cross section can be obtained without significantly reducing the ability to form an amorphous state and the ability to form a thin wire. The amount of partial substitution of the above Fe metal elements is limited to a total of 30 atomic % in all cases. Also, Al, Mn, P, C
Even if the alloy contains the following, it can be used as long as the ability to form an amorphous state and the ability to form fine wires are not significantly reduced. Next, in the present invention, the hole diameter D _N of the spinning nozzle
(μm) is preferably selected so as to satisfy the following general formula (). D _N ≦270−9｜Si−10｜−25｜B+Si/2−20｜
......() [However, D _N represents the pore diameter (μm) of the spinning nozzle, Si represents the Si atomic % in the alloy, and B represents the B atomic % in the alloy. ] The wire diameter D _F (μm) of the filament obtained using this spinning nozzle is the diameter D _N (μm) of the spinning nozzle hole.
It will be the same or slightly thinner. Fe− _Si−
Even if B or Fe-Me-Si-B alloy is melt-spun and cooled and solidified in a rotating cooling liquid, the resulting filament has a crystalline structure, is brittle, and has the characteristics of an amorphous metal. This results in poor practicality. The cooling liquid used in the present invention refers to, for example, a pure liquid, solution, emulsion, etc., which reacts with the spun molten metal to form a stable surface.
Alternatively, any material may be used as long as it is chemically non-reactive with the spun molten metal. In particular, in order to obtain a uniform amorphous continuous filament with a circular cross section by rapid cooling in the cooling liquid, it is necessary to select a filament with an appropriate cooling rate, and at the same time, the cooling liquid and liquid level must be stable and not disturbed. Moreover, it is desirable that the cooling rate can be further increased by artificial stirring. especially,
It is preferable to use water at room temperature or below room temperature, or an electrolyte aqueous solution in which a metal salt or the like is dissolved. Generally, the process of bringing molten metal into contact with a cooling liquid to rapidly cool it is considered to be divided into roughly three stages. In the first stage, the cooling rate is relatively slow, during which the vapor film of the coolant covers the entire metal, and the cooling is carried out by radiation through the vapor film. In the second stage, the vapor film ruptures, intense boiling occurs continuously, and heat is mainly removed as heat of vaporization, so the cooling rate is the fastest. In the third stage,
Boiling stops and cooling occurs by conduction and convection, so the cooling rate decreases again. That is,
In order to perform rapid cooling, (a) choose a coolant that will make the first stage as short as possible and reach the second stage quickly, and (b) cool the coolant as quickly as possible by artificial means. Alternatively, it is most effective to quickly move the molten metal to be cooled, destroy the first stage vapor film, and quickly move on to the second stage cooling. As an example, it is well understood that the cooling rate of intensely agitated water is about four times that of still water. In short, to increase the cooling rate,
As a cooling liquid, it must have a high boiling point, have a large latent heat of evaporation, which can speed up cooling, and have good fluidity because steam or bubbles dissipate quickly. Of course, it goes without saying that there are other problems such as being cheap and not deteriorating. Moreover, in order to artificially quickly destroy the first stage vapor film and move on to the second stage cooling, and to keep the coolant and the coolant level stable at all times, it is necessary to contain the coolant in the rotating body. To artificially increase the cooling rate, use a cooling liquid with a large specific heat, increase the rotation speed of the rotating body, increase the speed of the molten metal spouted from the spinning nozzle, It is desirable to increase the introduction angle of the molten metal to the cooling liquid surface and to shorten the distance between the spinning nozzle and the cooling liquid surface. The introduction angle of the spun molten metal with respect to the cooling liquid level refers to the angle formed by the tangent at the point where the spun molten metal first contacts the cooling liquid level and the spun molten metal. Next, the present invention will be explained in more detail with reference to the drawings. 1, 2, and 3 are apparatuses showing one embodiment of the present invention; FIGS. 1 and 2 are schematic diagrams of a horizontal type apparatus, and FIG. 3 is a schematic diagram of a vertical type apparatus. .
Reference numeral 1 denotes a crucible in which a raw metal 3 to be melt-spun is placed, and this crucible 1 is made of a suitable heat-resistant material, such as ceramic such as quartz, zirconia, alumina, and borium nitride. This crucible 1 has a nozzle 2 with one or more spinning holes, close to the desired diameter size of the metal filament. Like crucible 1, the material is made of heat-resistant materials such as quartz,
It is made of ceramics such as zirconia, alumina, and borax nitride, artificial ruby, and sapphire.
5 is a heating furnace for heating and melting the raw metal 3 to be melt-spun, 6 is a rotating drum rotated by a drive motor 7, and 8 is a cooling liquid surface 9 inside the rotating drum 6 due to centrifugal force. It is a cooling liquid that forms 10 is a pipe for supplying and discharging the cooling liquid 8. The type of cooling liquid 8 and its temperature are selected in relation to the heat capacity of the molten metal 4,
The heat capacity of the molten metal 4 increases in direct proportion to its temperature, specific heat, latent heat of fusion and its cross-sectional area. Therefore, the larger the heat capacity of the molten metal 4, the colder the cooling liquid or the higher its specific heat, density, heat of vaporization, and thermal conductivity.
Other desirable properties of the coolant are low viscosity, nonflammability, and low cost so as to minimize fragmentation of the molten metal 4 in the liquid medium. As a typical cooling liquid, water at room temperature or lower is used. However, in general, it is easier to obtain a high quality metal filament by increasing the cooling rate. Therefore, an electrolytic aqueous solution cooled to below room temperature, for example, a 10-25% by weight sodium chloride aqueous solution, a 5-15% by weight aqueous caustic soda solution,
A 10-25% by weight aqueous magnesium chloride solution and a 50% by weight aqueous zinc chloride solution are preferred. The introduction angle between the molten metal 4 and the coolant surface 9 and the rotation of the rotating drum 6 may be in any direction. The speed of the molten metal 4 spouted from the spinning nozzle 2 and the speed of the rotating drum 6 have a great influence on the ability to form fine wires, and the circumferential speed of the rotating drum 6 is the same as the speed of the molten metal 4 spouted from the spinning nozzle 2. It is preferable to use the same speed or faster.
In particular, it is preferable that the circumferential speed of the rotating drum 6 is 5 to 30% higher than the speed of the molten metal 4 spouted from the spinning nozzle 2. Further, the circumferential speed of the rotating drum 6 is preferably 300 m/min or more from the viewpoint of stably retaining the cooling liquid within the drum and increasing the cooling rate. The size of the introduction angle is preferably 20° or more. Further, the distance between the spinning nozzle 2 and the coolant surface 9 is preferably as close as possible within a range where the spun molten metal 4 is not disturbed, broken, or cut, and is particularly preferably 10 mm or less. 11 is an air piston for supporting the crucible 1 and moving it up and down; 12 is an air piston for moving the crucible 1 from side to side at a constant speed, and winding up the cooled and solidified metal filament continuously and regularly on the inner wall of the rotating drum 6; It is a twill shaker for. In addition, Fig. 3 shows a device that is mechanically a vertical version of the device shown in Figs. 1 and 2.
The advantage is that there is no need to supply or drain the coolant, and that a uniform coolant level can be achieved even at very low speeds. Conversely, when the rotational speed is changed, the angle of the coolant level changes (in the case of low speed rotation, the coolant moves in the direction of the liquid level indicated by the dotted line). Furthermore, in order to make the spun molten metal perpendicular to the surface of the cooling liquid, it is necessary to modify (bend) the spinning nozzle. 14 is a shielding plate that can be detached from the rotating drum 6;
A transparent plate is preferable so that the state during spinning and winding can be clearly observed. The raw metal 3 is first introduced through the inlet of the crucible 1 by gas fluid transport or the like, and is heated and melted in the heating furnace 5 . At the same time, the drive motor 7 sets the rotary drum 6 at a predetermined rotational speed, and the coolant is supplied to the inside of the rotary drum 6 from the coolant supply pipe 10 . Next, the spinning nozzle 2 is lowered by the traverse shaker 12 and the air piston 11 to the position shown in FIGS. In addition, molten metal 4 is introduced towards the coolant level 9. In order to prevent the raw metal 3 from oxidizing, an inert gas 15 such as argon gas is constantly fed into the crucible 1 to create an inert atmosphere. The metal introduced into the cooling liquid surface 9 advances through the cooling liquid 8 due to the resultant force of the ejection direction, the rotational direction of the rotating drum, and the centrifugal force, and is cooled and solidified, and is deposited on the inner wall of the rotating drum 6 or on the accumulated metal filament that has already been cooled and solidified. 1
3 is wound regularly by a twill vibrator 12. After spinning is completed, the tip of the coolant discharge pipe 10 is inserted into the coolant 8 and the coolant is discharged. By stopping the rotating drum 6 and removing the shielding plate 14, it is possible to obtain a high-quality amorphous metal filament 13 with a circular cross section and integrated on the inner wall of the rotating drum 6. This form can be used directly as a product. Furthermore, it is of course possible to rewind the amount to a smaller amount depending on the amount used. Further, in order to obtain an amorphous metal filament with higher strength and higher quality, wire drawing processing or the like can be performed using a die. In the present invention, a metal filament with a circular cross section refers to the longest axis diameter R _nax and the shortest axis diameter of the same cross section.
The roundness of R _nio ratio R _nio / R _nax × 100 is 70 (%) or more. Whether or not the obtained metal filament had an amorphous structure was determined by X-ray diffraction measurement. (Example) Next, the present invention will be specifically explained using examples. Examples 1 to 11, Comparative Examples 1 to 13 Using an apparatus having a horizontal rotating drum with an inner diameter of 500 mm as shown in Figs. melts at temperatures higher than 70℃, various pore sizes D _N
By adjusting the argon gas pressure from a (μm) spinning nozzle (Ruby), the molten metal was spouted at a speed of 400 m/min and introduced into water (5° C.) to a depth of 25 mm. The speed of the rotating drum at this time was 400 m/min, and the introduction angle was
It was 75 degrees. The spouted molten metal was rapidly cooled and solidified in the cooling water, and continuously accumulated on the inner wall of the rotating drum due to centrifugal force. At this time, the distance between the spinning nozzle and the cooling liquid level was maintained at 5 mm. Note that the ejection speed of the molten metal was measured from the weight of the metal collected after ejecting it into the atmosphere for a certain period of time. Alloy composition used, spinning nozzle hole diameter D _N (μm),
The fine line forming ability and the X-ray diffraction results are summarized in Table 1.

[Table] The alloys of Experiment Nos. 3, 13, and 19 had a low ability to form fine lines, and samples suitable for X-ray diffraction measurements could not be obtained. In Experiment Nos. 1, 5, 7, and 9, the diameter D _N (μm) of the spinning nozzle used did not satisfy the formula () and was too large, so a filament with an amorphous structure could not be obtained. Experiments No. 11 to 24 are Fe
Some of the metal elements include Co, Ni, Cr, Mo, V, Zr,
Among the alloys substituted with W, Experiment No. 11, 13,
Nos. 15, 17, 19, 21, and 23 had a large amount of substitution and were outside the scope of the present invention, so it was not possible to obtain a filament with an amorphous structure. To measure the uneven thickness in the length direction, the diameter was measured at 10 random points over a 10 m trial length, the difference between the maximum and minimum diameters was divided by the average diameter, and the result was multiplied by 100. Note that the X-ray diffraction analysis was performed using FeKα irradiation. Example 12 An alloy with a composition of 77.5 atomic% Fe, 10 atomic% Si, and 12.5 atomic% B was melted in an argon atmosphere and melted with argon gas 3.5 kg/cm ² gauge pressure from a spinning nozzle hole diameter (D _N ) of 150 μm. Spraying metal, rotating drum speed
Example 1 except that the guide was conducted at 480 m/min and at an introduction angle of 60°.
A metal filament was produced in the same manner. Note that the jetting speed of the molten metal at this time was 430 m/min. The average diameter of the obtained metal filament is 135μ
It was a high-quality amorphous ultrafine filament with m, circularity of 98%, and thickness unevenness in the length direction of 2.5%. The above filament has excellent mechanical and thermal properties with a tensile strength of 320 Kg/mm ² and a crystallization temperature of 500°C. Moreover, when this filament is drawn to a diameter of 110 μm at room temperature using a diamond die, The tensile strength was improved to 400 Kg/mm ² , and the filament was a very uniform amorphous ultrafine filament. Example 13 Fe71.3 at%, Cr6.2 at%, Si10 at%,
An alloy with a composition of 12.5 atomic % B was melted in an argon atmosphere, and the average diameter was 135 μm in the same manner as in Example 2.
A high-quality ultra-fine filament with a roundness of 95% and thickness unevenness in the length direction of 5% was obtained. This filament was exposed to X-
When line diffraction analysis was performed, only broad diffraction peaks characteristic of the amorphous state were observed. When the mechanical strength and crystallization temperature of this filament were measured, they were 350 Kg/mm ² and 550° C., respectively, and the effect of adding Cr was also recognized. Example 14 Fe58 at%, Co14.5 at%, Si10 at%,
An alloy with a composition of 17.5 atomic percent B is melted in an argon atmosphere, and the molten metal is spouted at a speed of 500 m/min from a 180 μm spinning nozzle (D _N ) with 4.0 Kg/cm ² gauge pressure of argon gas to a depth of 30 mm. Concentration cooled to −15℃ of
It was introduced into a 20% aqueous sodium chloride solution. The speed of the rotating drum at this time was 550 m/min, and the introduction angle was 80°. The spouted molten metal was rapidly solidified in a cooled sodium chloride aqueous solution at -15°C, and was continuously accumulated on the inner wall of the rotating drum by centrifugal force. The resulting metal filament has an average diameter of 160μ
m, roundness was 94%, thickness unevenness was 4%, and strength was 300 kg/ ^mm2 . In addition, in order to increase mechanical strength and uniformity, we used a diamond die with a diameter of 130 μm.
After wire drawing, the strength was 380Kg/mm ²
It became. When this metal filament was measured by X-ray diffraction using FeKα irradiation, only a broad diffraction peak characteristic of an amorphous state was observed. (Effects of the Invention) The amorphous metal filament with a circular cross section of the present invention is inexpensive, has extremely high strength, is not work hardened, and has excellent mechanical properties such as extremely viscous (toughness). By making the cross section circular and reducing thickness unevenness in the length direction, secondary processing such as wire drawing, twisting, weaving, and knitting is now possible, making it easier to manufacture than before. plate-shaped,
It can be used as woven, knitted, twisted, etc. fiber materials that cannot be applied to powdered amorphous metals, and as various industrial materials such as electrical and electronic parts and composite materials.
Very useful.

[Brief explanation of drawings]

1 and 2 are schematic views showing an example of a model device used in the present invention, and FIG. 3 is a schematic view showing an example of a vertical type device used in the present invention. 1... Crucible, 2... Spinning nozzle, 3... Raw metal, 4... Molten metal (flow), 5... Heating furnace, 6
... Rotating drum, 7 ... Drive motor, 8 ... Cooling liquid, 9 ... Cooling liquid level, 10 ... Cooling liquid supply,
Discharge pipe, 11... air piston, 12... traverse shaker, 13... metal filament, 14... shielding plate, 15... inert gas.

Claims (1)

[Claims] 1 Si is 17.5 atomic % or less, B is 5 to 22.5 atomic %, Si
The alloy is made of an alloy in which the sum of
An amorphous metal filament that has a wire diameter that satisfies the following, has a circular cross section, and has a thickness unevenness of 12% or less in the length direction. D _F ≦270−9｜Si−10｜−25｜B+Si/2−20｜
………() [However, D _F is the filament wire diameter (μm), Si
represents Si atomic % in the alloy, and B represents B atomic % in the alloy. ] 2 Si 17.5 atomic% or less, B5 to 22.5 atomic%,
An alloy containing 30 atomic % or less of one or more metals selected from the group consisting of Co, Ni, Cr, Mo, V, W, and Zr, and the balance consisting essentially of Fe (however, Si and The sum with B is 20 to 32.5 atomic%,
Co30 at% or less, Ni20 at% or less, Cr10 at%
Below, Mo is 10 atomic % or less, V 5 atomic % or less, W 5 atomic % or less, and Zr 5 atomic % or less. ),
An amorphous metal filament that has a wire diameter that satisfies the following general formula (), has a circular cross section, and has thickness unevenness in the length direction of 12% or less. D _F ≦270−9｜Si−10｜−25｜B+Si/2−20｜
………() [However, D _F is the filament wire diameter (μm), Si
represents Si atomic % in the alloy, and B represents B atomic % in the alloy. ]